Green’s Dictionary of Slang

(Aus.) a McDonald’s hamburger restaurant.

2005		P. Temple Broken Shore (2007) [ebook] Theer’s blokes with three degrees and blokes can’t read the Macca’s menu.
2013		‘Australia Day’ ad for McDonald’s cited on crikey.com.au 10 Jan. 🌐 But there’s only one place on earth where you can get Macca’s.
2021		Betoota-isms 123: ‘I was driving past Macca’s and saw about five cop cars with lights flashing [etc]’.